EP3050538A1 - Cavité de prothèse de la hanche - Google Patents

Cavité de prothèse de la hanche Download PDF

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Publication number
EP3050538A1
EP3050538A1 EP15152592.0A EP15152592A EP3050538A1 EP 3050538 A1 EP3050538 A1 EP 3050538A1 EP 15152592 A EP15152592 A EP 15152592A EP 3050538 A1 EP3050538 A1 EP 3050538A1
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EP
European Patent Office
Prior art keywords
continuous surface
pyramids
webs
pan
distance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP15152592.0A
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German (de)
English (en)
Inventor
Sylke Drenckhan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aq Implants GmbH
Original Assignee
Aq Implants GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Aq Implants GmbH filed Critical Aq Implants GmbH
Priority to EP15152592.0A priority Critical patent/EP3050538A1/fr
Publication of EP3050538A1 publication Critical patent/EP3050538A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/34—Acetabular cups

Definitions

  • the present invention relates generally to prosthetic implants, and more particularly relates to the implant of acetabular cup assemblies that secure a prosthetic bearing element in the acetabular cup for receiving a femoral head of a hip joint.
  • the present invention relates to a socket of such a prosthetic bearing element having an inner receptacle for rotatably supporting a femur and having a bone cell ingrowth-promoting surface design provided over an outer continuous surface of the socket.
  • a pan with the ingrowth of bone cells favoring surface design is for example from WO 2008/146141 A2 known.
  • the present invention seeks to provide such a pan, the surface design of which favors the ingrowth of bone cells in an improved manner.
  • a pan having the features of claim 1 is proposed. This is characterized by the fact that the surface design comprises webs which delimit the lateral surface of pyramids whose base surface runs essentially parallel to the continuous surface from which the webs protrude.
  • the surface design accordingly has cells that are provided within the pyramid. It can also be a double pyramid, which is applied to the continuous surface.
  • a special form of the double pyramid is the octahedron, consisting of three perpendicular squares.
  • the webs of a pyramid form a pyramid tip, which is preferably connected to the continuous surface.
  • the base of such a pyramid formed at a distance from the continuous surface, but this extends substantially parallel.
  • the continuous surface of a pan is usually spherical.
  • the webs are preferably rectilinear, ie stretch in a plane lying rectangles, preferably squares on.
  • the cells formed by the pyramids promote the ingrowth of bone cells.
  • resulting from the straight and usually four to a point at the level of the continuous surface intersecting webs undercuts which lock the ingrown bone cells positively against the surface design of the pan and thus safely connect the bone cells with the pan.
  • the pyramid is formed as a double pyramid, such undercuts arise on two superimposed planes, namely between the base and the continuous surface under the converging from a lower tip of the lower pyramid outward webs on the one hand and between the base and the maximum distance of the continuous surface provided pyramid tip on the other.
  • An improved anchoring of the bone cells on the surface design and a more solid cell structure, which allows the ingrowth of bone cells and is formed by the webs of the surface design, is created by the fact that the top of two perpendicular rectangles of the double pyramid, in the special case of an octahedron of vertical formed squares is formed.
  • a third rectangle perpendicular to these two rectangles or squares extends substantially parallel and at a distance from the continuous surface.
  • the third rectangle or square is preferably defined solely with its corner points, which are formed by the vertices of the first and second rectangles.
  • the third rectangle and thus the base surface is thus preferably circumscribed only by the imaginary envelope surface which is defined by the corner points of the same connecting straight lines.
  • Adjacent double pyramids are preferably connected to each other at the height of the third rectangle.
  • the third rectangles in the circumferential direction or height direction and halfway up the height of the double pyramid usually have adjacent third rectangles or squares of adjacent double pyramids.
  • a double pyramid projecting from the continuous surface has at least two adjacent double pyramids in the circumferential direction and a corresponding number of adjacent ones in the height direction Double pyramids.
  • an extension direction is to be understood parallel to that plane to which the inner receptacle opens for the rotatable mounting of the thigh.
  • the perpendicularly extending path from this receptacle to the bottom of the pan on the outer peripheral surface should be understood as a height direction.
  • the third rectangles or squares i. H. the bases of the double pyramids connected to each other and preferably in the circumferential direction of the pan.
  • pyramids arranged next to one another are connected to one another via the third rectangle or square.
  • the connection preferably takes place solely via the vertices of the third rectangles. Two adjacent bases thus have two common vertices.
  • This configuration results in imaginary, circumferential in the circumferential direction rung structures, which are offset in the vertical direction, the vertices of the third rectangles or squares form the nodes and thus grid mesh points of this circumferential, imaginary rung structure.
  • the grid mesh points of a single rung structure are radially spaced around the continuous surface of the pan. The radial distance of the grid mesh points from the continuous surface is preferably at most between 1 and 2 mm.
  • a pyramid is usually located between the grid network points and the continuous surface, whereas a pyramid of usually the same dimension radially outside the rung structure rises from the latter.
  • the said distance between the continuous surface and the grid mesh points of a single rung structure may be approximately constant in the circumferential direction.
  • the radial distance between the grid mesh points of the circumferential rung structure and the continuous surface may be wave-shaped, so that in certain peripheral portions, the rung structure approaches the continuous surface, but in other areas distance from this continuous surface wins.
  • the base area and the radial distance of the grid points of a single, preferably all circumferential rung structures is regularly chosen that the rung structure circulates paragraph-free with a constant base area per circumferential rung structure around the continuous surface; With a constant radius of the rung structure, this thus results as an integer multiple of the extent of the base area, ie the associated grid grid points in the circumferential direction.
  • this distance decreases with increasing approach of the respective circumferential rungs structure to the bottom of the pan.
  • the distance in the circumferential direction for each individual ring of the rung structure according to the above proviso near the entrance level to the inner receptacle initially be identical. With increasing distance from the entrance level to the inner receptacle, however, this distance decreases. The distance can decrease continuously towards the edge of the pan.
  • the gap it is preferred to leave the gap unchanged up to a height of between 50 to 70 percent of the overall height and only to reduce the distance in the remaining height portion of the pan.
  • the distance can approach zero in the area of the ground.
  • very small pyramids circulating in a circular path with grid mesh points a few tenths of a mm away from the continuous surface, or no pyramids can be provided.
  • double pyramids may be provided in the area of the entrance level, only a simple pyramid may be provided in the region of the ladle floor, which, however, may have a rectangle which is closed circumferentially by webs as the base area.
  • the ratio of distance to web length in the circumferential direction and / or height direction of the rectangular base areas is preferably kept substantially constant in all rung structures.
  • the web lengths are identical in square base area both in the circumferential direction as well as in the vertical direction. If the distance of the respective base from the continuous surface of the pan is correspondingly lower, smaller cells also result due to a reduced length of the respective rungs in the height or circumferential direction.
  • the surface which promotes the ingrowth of bone cells preferably comprises only webs which delimit the lateral surface of pyramids. All cells are thus defined by pyramids or double pyramids.
  • the continuous surface favors the ingrowth of bone cells, but also the morphology of the continuous surface as such.
  • R a roughness
  • This surface may be roughened by blasting, for example, to achieve a roughness R a of between 4 and 6.
  • the surface can be modified by means of plasma sprays in order to realize a surface roughness rather in the upper part of the claimed interval.
  • FIG. 1 shows a schematic-perspective side view of a structure 2, which is the smallest cell of a in FIG. 2
  • Overall surface designation designated by reference numeral 4 represented on a continuous surface 6 of an in FIG. 2 formed with the reference numeral 8 pan is formed.
  • the structure 2 is a double pyramidal structure having a first square 10 and a second square 12 each defining a surface extending at right angles to the continuous surface 6 and oriented at right angles to each other.
  • the squares 10, 12 are respectively stretched by rectilinearly extending identical webs 14, which at the point of intersection of the two squares 10, 12 form a lower tip 16 connected to the continuous surface 6 and an upper tip 18 at its opposite end.
  • the webs 14 shown bound the lateral surface of a lower pyramid 20 and / or an upper pyramid 22.
  • the two pyramids 20, 22 terminate at the intersections of the webs 14 of the same square 10 and 12, respectively.
  • the double pyramid shown is at this intermediate height no third square of webs is enveloped over the continuous surface, which interconnect the corner points of the two squares 10, 12 located there.
  • the base of the double pyramid is spanned, which, however, is not circumferentially bounded by webs, but results as envelope by imaginary connecting lines that connect the marked with reference numeral 24 vertices of the double pyramid 20, 22.
  • the webs 14 usually have a web width of between 0.6 and 0.8 mm, preferably of about 0.7 mm.
  • the height of the double pyramid, d. H. the distance from the continuous surface 6 to the upper tip 18 can be a maximum of 3 mm.
  • this surface structure 4 is basically formed on the entire continuous surface 6.
  • a ring 28 is initially provided circumferentially, which merges via a likewise circumferential profiling 30 in that area in which the ingrowth of bone cells favoring surface design 6 is formed.
  • the input plane 26 is that plane to which opens an unrecognizable inner receptacle for the rotatable mounting of a thigh.
  • This surface structure 4 comprises a plurality of circumferential rows 32, which are formed continuously in the circumferential direction and comprise a plurality of structures 2, which with reference to FIG. 1 have been described above.
  • the corner points 24 of two adjacent structures 2 abut one another in the circumferential direction. So the adjacent structures 24 are connected to each other at mid-height.
  • Two adjacent Doppelpyramiden Modellen 2 share accordingly equal vertices 24.
  • the respective rows 32 are not interconnected. There may be provided between 10 and 15 rows 32 one above the other. Depending on the size of the pans (approx.
  • pan shape round, oval
  • the number decreases with increasing approach to the bottom 34 of the pan 8 and can run out to number 0 to the bottom 34.
  • the base surfaces of circumferentially circumferentially arranged behind each other pyramids encircling grid grid points in the form of the respective vertices 24.
  • These grid mesh points 24 are provided with a maximum distance of between 1 and 2 mm to the continuous surface 6.
  • the distance decreases with increasing approach of the rotating grid network points 24 to a bottom 34 of the pan 8.
  • the distance to about two-thirds of the height H of the pan 8 is identical in this case.
  • the corresponding distance is in FIG. 3 marked with "2/3 H".
  • the double pyramids of the surface design 4 are each formed identically.
  • About the remaining height to the bottom 34 of the corresponding distance of the grid network points 24 decreases from the continuous surface 6 from. In the present case, this distance in the region of the bottom is only a few tenths of a millimeter.
  • the surface design 4 shown in the exemplary embodiment can easily be produced by additive / additive manufacturing methods, such as, for example, the selective laser melting (SLM) or electron beam melting (EBM) or direct metal laser sintering (DMLS).
  • SLM selective laser melting
  • EBM electron beam melting
  • DMLS direct metal laser sintering
  • the corresponding surface design 4 is usually produced in one piece by melting or sintering a Pulverschuttung with the continuous surface 6 and the underlying metallic structure of the pan 8. This results in an intimate bond between the surface design 4 and the underlying base of the pan 8.
  • the continuous surface 6 also has a certain roughness, so that there is an enlarged surface and to provide microscopic projections that allow improved bonding between the organic cells and the pan 8.
  • the invention is not limited to the embodiment shown.
  • a single pyramid which is connected with its lower tip 16 with the continuous surface 6 and at the level of the corner points 24 has a third square, which forms the base of the pyramid and the corner points connecting, rectilinear webs comprises.
  • Rows of these pyramids can be connected to each other via common webs, which extend in the height direction of the pan 8. Underneath these common webs there likewise results a cell in which cell growth can take place, wherein the resulting cell structure is surmounted by the webs bounding the lateral surface of the pyramid, whereby an undercut is formed.
  • the base of the pyramid is at the level of the continuous surface 6.
  • the pyramid has an upper tip 18, which forms the highest point of the surface design.
  • Such pyramids can be provided so that the bases of adjacent pyramids directly adjacent to each other.
  • the adjacent pyramid can also have a pyramid surface, which is provided in half in the base of the other pyramid, so that the webs of the two pyramids intersect at least partially.
  • a substructure is created within the cell formed by each individual pyramid, through which the ingrowing bone cells are covered and thus secured in an improved manner with respect to the pan.
  • two pyramid fields are provided superimposed on the continuous surface.
  • a pyramid field is understood to mean an arrangement of pyramids, which are provided with their respective base surfaces directly next to one another or one behind the other. This results in a grid of base areas. This grid is square or rectangular. At an intersection of this grid, webs of four adjacent pyramids protrude from the continuous surface accordingly.
  • a second pyramid field which is formed, for example, identical to the first pyramid field but superimposed with an offset thereto, can lead to an embodiment in which webs of the pyramids of the first pyramid field intersect with webs of the second pyramid field. It is conceivable, for example, an arrangement in which the pyramids have a square base and are provided with identical height.
  • the intersections of Base areas of two pyramids of the second pyramid field are preferably exactly centered in a base of a pyramid of the other pyramid field. In this case, the webs of the two pyramid fields intersect preferably at the middle height of the pyramids.
EP15152592.0A 2015-01-27 2015-01-27 Cavité de prothèse de la hanche Withdrawn EP3050538A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15152592.0A EP3050538A1 (fr) 2015-01-27 2015-01-27 Cavité de prothèse de la hanche

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15152592.0A EP3050538A1 (fr) 2015-01-27 2015-01-27 Cavité de prothèse de la hanche

Publications (1)

Publication Number Publication Date
EP3050538A1 true EP3050538A1 (fr) 2016-08-03

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EP15152592.0A Withdrawn EP3050538A1 (fr) 2015-01-27 2015-01-27 Cavité de prothèse de la hanche

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EP (1) EP3050538A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002064066A2 (fr) * 2001-02-14 2002-08-22 Staeubli Hans Ulrich Cotyle implantable pour des endoprotheses de l'articulation de la hanche
EP1527757A1 (fr) * 2003-11-03 2005-05-04 Finsbury (Development) Limited Implant prothétique
WO2008146141A2 (fr) 2007-05-29 2008-12-04 Lima - Lto Spa Elément prothétique et son procédé de fabrication
EP2502604A1 (fr) * 2011-03-21 2012-09-26 Jossi Holding AG Implant de poêle articulée
WO2013064832A1 (fr) * 2011-11-02 2013-05-10 Finsbury (Development) Limited Prothèse

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002064066A2 (fr) * 2001-02-14 2002-08-22 Staeubli Hans Ulrich Cotyle implantable pour des endoprotheses de l'articulation de la hanche
EP1527757A1 (fr) * 2003-11-03 2005-05-04 Finsbury (Development) Limited Implant prothétique
WO2008146141A2 (fr) 2007-05-29 2008-12-04 Lima - Lto Spa Elément prothétique et son procédé de fabrication
EP2502604A1 (fr) * 2011-03-21 2012-09-26 Jossi Holding AG Implant de poêle articulée
WO2013064832A1 (fr) * 2011-11-02 2013-05-10 Finsbury (Development) Limited Prothèse

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